Orange vat-dye and process of making same.



all it ma l concern:

UNrrEn srlitrns PATENT oFFioE.

ALBRECHT somnnr AND CARL'PRETZELL, or nocns'r-oN-TnE- AIN, GE MANY, ASSIGNORS TO FARBWERKE VORM, MEISTER LUGIUS & BRuNINe, OFHCCHST-ON-THE-MAIN, GER

MANY, A CORPORATION OF GERMANY.

.GRANGE 'VAT-DYE AND. IROCESS OF MAKING SAME.

Specification of Letters Patent.

'Applidatibn filed July 24.1907. Serial No. 385.318.

Be it known that we, 'ALBREOHT SCHMIDT, jl'gh. DJ, and CARL PRETZELL, Ph. 1)., chemhis, citizens of the Empire of Germany; and

residing at Hchst-omthe-Main, Germany, have invented certain new and useful Improvements in Making Orange Vat Dyestuffs, of which the following is a specification. r

We have found that, if the brown vat dyestuff resulting, for instance, by heating metaacetylamidophenylthioglycollic-orthocarboxylic acid soon OJQS-CELCOOH 1 miocon, a

with alkalihydrate and oxidizing the isolated leuco-body thus obtained, be treated with halogen, new, very Valuable orangecolored vat dyestuffs ma be obtained.

Example I. 10 parts by weight of the aforementioned brown yat dyestufi are stirred with about 100 parts of a dlluent, "for instance, chlorbenzene, nitrobenzene, glacial acetic acid and the and; treated with.

about 20 parts by weight of bromin. On the spontaneous heating having ceased, the

massis heated for seine time in a reflux 0011- denser, filtered and washed with alkaline,-

water and" then with: alcohol. The brown powderthus obtained is insoluble in alcohol,

acetone, soluble with difficulty in hot nitrobenzene withv an orangerbro'wn c'olor, soluble .in concentrated sulfuric acid with a cornflowe'r-blue color. The dyestuil' containsmore-or less bromin according to the proportion of the latter. The dyestuff is easily reduced with alkaline hydrosulfite to a golden yellow liquid from which solution it colored tints.

dyes cotton and wool very fast pure orange Example 11. Into a suspension of 10 parts Patented Dec., 3, 1907.

by weight of the orange brown vat dyestufi I chlorinated dyestuff is isolated as inexampie I and is similar in every respect to the brominated dyestufi' afor'edescribed. For

bromin, brominor chlorin-yielding subv stances may be used.

we' claim is Having now described our invention, What l. The recess herein described of peak g orange co ored vat dyestuiis, which consists in treating with a halogen the brown vat, dyestui'iobtained by heatin metE-acetyl-Y arnildophenylthioglycollic ort ho carboxylic ac-i colored Vat 'dyestuii, being insoluble in water, alkalies, dilute acids, alcohol, acetone, soluble with drthculty in hot mtrobenzene with an orange-,brown color, soluble 1T1 concentrated sulfuric acid with a cornflowerblue color, yielding with alkaline hydrasulfite a vatirom which cotton and wool are dyed in fast orange colored tints.

in presence of two subscribing witnesses.

ALBRECHT SCHMIDT;- CAR-L PRETZELL.- Witnesses JEAN GRUND, CARL GRUND. 

